dell 2007 WFPb monitor ,no lights

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • aortiz
    Senior Member
    • Feb 2014
    • 120
    • mexico

    #1

    dell 2007 WFPb monitor ,no lights

    i have this dell 2007 WFPb monitor that has a blue power on light,what it seems a dim backlight,i have to turn the lights off in my room and bench to see it,is kind of reddish color (i think,then again i know nothing about monitors, except for what i have been reading on the posts from other people)
    i took it apart ,the boards are out and i am enclosing pictures of it,which i hope are good enough to see a possible problem.i have a FLUKE 79 series 2 multimeter,solder sucker,solder wick,and a 35 watt soldering iron.
    the problem is since i dont know about monitors i dont know where to start.
    thanks top those that have replied to my post which i havent replied with their request ,but being new to this i had not been able to start a new thread,but,it looks like i finally did.i am going to have to post the pictures in a little while my camera has a ead battery,it will take a little while to charge.
    meanwhile ,what can you guys recommendi start checking.?
    thank you
  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #2
    Re: dell 2007 WFPb monitor ,no lights

    While you have the inverter board out for pictures you can test the 3 inverter transformers
    Measure the resistance between pins 1-8 and 4-5 for all 3 transformers. You should have 6 readings. Post your results. They should be within 3% of each other. I expect readings in the 1023 ohm range.


    https://www.badcaps.net/forum/attach...1&d=1336881010
    Last edited by selldoor; 02-14-2014, 02:51 PM.
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • aortiz
      Senior Member
      • Feb 2014
      • 120
      • mexico

      #3
      Re: dell 2007 WFPb monitor ,no lights

      thank you selldoor,here are the readings;
      T801 pins 1to 8 =1060 pins 4 to 5 =1067
      T802 pins 1 to 8=1076 pins 4 to 5 =1081
      T803 pins 1 to 8=1065 pins 4 to 5 =1068
      Attached Files
      Last edited by aortiz; 02-14-2014, 03:52 PM. Reason: add pictures

      Comment

      • selldoor
        Slow Learner
        • Dec 2010
        • 7870

        #4
        Re: dell 2007 WFPb monitor ,no lights

        Originally posted by aortiz
        thank you selldoor,here are the readings;
        T801 pins 1to 8 =1060 pins 4 to 5 =1067
        T802 pins 1 to 8=1076 pins 4 to 5 =1081
        T803 pins 1 to 8=1065 pins 4 to 5 =1068
        They look good. Do you get any bright flash from the screen at all when you turn it on or is it dark all the time.

        Does the power led stay the same color all the time?

        You say you can see a reddish light but when connected to a pc can you see an image of what the pc is producing.
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • aortiz
          Senior Member
          • Feb 2014
          • 120
          • mexico

          #5
          Re: dell 2007 WFPb monitor ,no lights

          the screen its dark all the time,the led its blue always,that redish light its there when connected to a pc,it does go out after maybe 3 seconds ,kind of acts like if it didnt have a signal,by the way did you see the pictures i posted ,i attached them to the same post with the ohms reading,i edit it.

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: dell 2007 WFPb monitor ,no lights

            I have seen the pictures now - thank-you. Its getting late here so just a couple of quick tests on the power supply - BUT not powered can you test the fuses.
            Meter on ohms 200 should read the same as touching the probes together.

            There is a white one and four small perhaps green ones with a G on.

            Also one cap looks crushed - is it just the casing or is it damaged?
            Attached Files
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • Davi.p
              Hobbist Tech
              • Sep 2009
              • 4287
              • Italy - Milan

              #7
              Re: dell 2007 WFPb monitor ,no lights

              Hi, i want to say that i don't have read all what you have write in Budm thread, and then i have a question to you, you said:
              "that redish light its there when connected to a pc,it does go out after maybe 3 seconds ,kind of acts like if it didnt have a signal" do you mean that the monitor starts with a dark reddish picture and after 3 secs the screen turns black? If yes is a very common behavior with aged backlight lamps (ccfl), now in this case you can choose to change those lamps that after an inspection you find with darkened ends, but this is a challenging work (took me about 2 hours), or modify the protection to let the monitor function also with aged lamps until the real end of life, this is a bit easier way but i dont know how long it will last..

              Comment

              • aortiz
                Senior Member
                • Feb 2014
                • 120
                • mexico

                #8
                Re: dell 2007 WFPb monitor ,no lights

                the fuses check ok,the cap its just the plastic casing ,i checked with the multimeter in ohms anyway and it seems to be charging and discharging ok.
                still trying to unsolder the transformer t801 ,its harder than i thought would be.
                sorry ,its only 5 pm here i thought its the same everywhere ,i forgot you way acroo the ocean in another continent.
                have a good night

                Comment

                • aortiz
                  Senior Member
                  • Feb 2014
                  • 120
                  • mexico

                  #9
                  Re: dell 2007 WFPb monitor ,no lights

                  the screen does not show anything with a pc connected to it .its black
                  the reddish background screen (that i can see only if the room lights are off) comes on right away with a pc connected ,but it turns black after the few seconds.
                  with a pc disconected it does the same thing,in both cases the blue square that says "no analog signal" never shows.and the screen is reddish,after few seconds it goes black
                  maybe tomorrow you can show me how to modify the protection and see if thats it.
                  i think i have a screen with lamps ,but its from a viewsonic that the lcd broke,but the plugs are different ,the sony has 2 wide connectors with 4 pins each and 2 skinnier connectors with 2 pins each.the viewsonic has 4 skiiny connectors with 2 pins each.
                  anyway,see you tomorrow

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: dell 2007 WFPb monitor ,no lights

                    Here are some of the voltages readings on the board. Too many pictures to post here. Not sure if you already if you already post the answer, but the fuse on the inverter board is OK?
                    http://s807.photobucket.com/user/bud...?sort=3&page=1

                    BTW: There are more than one version of 2007.
                    http://s807.photobucket.com/user/bud...?sort=3&page=1

                    http://s807.photobucket.com/user/bud...?sort=3&page=1
                    Last edited by budm; 02-14-2014, 05:31 PM.
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • Davi.p
                      Hobbist Tech
                      • Sep 2009
                      • 4287
                      • Italy - Milan

                      #11
                      Re: dell 2007 WFPb monitor ,no lights

                      Here are 0:30 Am, "tomorrow" is Saturday and maybe i will not work so can stay up again..
                      you must be more clear with sympthoms if not i write wrong suggestions.. do you never see an image on screen? One thing is "reddish" another is "red", i mean for reddish an image with red tint but i'm starting to think that you see only a dark solid red screen..
                      Last edited by Davi.p; 02-14-2014, 05:39 PM.

                      Comment

                      • aortiz
                        Senior Member
                        • Feb 2014
                        • 120
                        • mexico

                        #12
                        Re: dell 2007 WFPb monitor ,no lights

                        thank you budm,i am not sure if FP801 ,next to a white ,9 pin connector ,is a fuse, and if its the one you are talking about ,but its good=.1 ohms.
                        i do get .5 ohms readings on pins 3 to 6 and 2 to 7 on all the transformers on the inverter? board,tha one that has the connectors for the lamps,i took T803 out to measure it ,just to make sure it wasnt something else causing that reading and yes its reading .5 ohms on the 2 windings ,which i presume are primary windings,just guessing.
                        anyway,are this readings correct,somewhere i read that the primary windings are mostly around 1.5 ohms,can all 3 transformers be shorted?
                        please advise.
                        thank you

                        Comment

                        • aortiz
                          Senior Member
                          • Feb 2014
                          • 120
                          • mexico

                          #13
                          Re: dell 2007 WFPb monitor ,no lights

                          i never see an image
                          its reddish because its not red
                          its like a very fainted red,very light and can only see it with no lights on around the monitor.
                          and no,i dont see only a dark solid screen
                          it is solid dark screen until after a few seconds,2 ,3 seconds .
                          i havent timed yet but its a very short time.
                          thank you davi.p sorry you cant sleep.

                          Comment

                          • aortiz
                            Senior Member
                            • Feb 2014
                            • 120
                            • mexico

                            #14
                            Re: dell 2007 WFPb monitor ,no lights



                            here is a picture of the transformer with pin outs
                            Attached Files

                            Comment

                            • selldoor
                              Slow Learner
                              • Dec 2010
                              • 7870

                              #15
                              Re: dell 2007 WFPb monitor ,no lights

                              Not sure what you are doing here or why ??

                              We know the pin out of the transformer - its written on the board.

                              and I already said the transformers look good and I cant see that anyone
                              has said otherwise?

                              If you get it all put back together we can do other tests.

                              EDIT I see now - PLEASE stop posting in the other thread it is meant to be for reference purposes only and is now being cluttered up. Davi P should have known that.
                              Dont think you need worry about the other pins appearing short the primary will be very low ohms when off the board - I have just tested similar one here and get 1ohm. hope you havent damaged it removing it.
                              Last edited by selldoor; 02-15-2014, 05:48 AM.
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment

                              • Davi.p
                                Hobbist Tech
                                • Sep 2009
                                • 4287
                                • Italy - Milan

                                #16
                                Re: dell 2007 WFPb monitor ,no lights

                                "thank you davi.p sorry you cant sleep." Hi, i don't have said i cant sleep...
                                so let me understand, 1. you never see an image 2. when you switch on you see a dark faint red for 3 sec. then black, but in those 3 sec., and after, does you see a backlight ON? if you are not sure what i mean try to power on with lvds connection (ribbon between logic board and lcd panel) disconnected, does you see a white image at least for 3 sec.? Also, with all connected (also lvds) does you see a dark image if you point a lamp from the side to screen? if you don't i don't know why people here are troubleshooting you for bad backlight..

                                Comment

                                • selldoor
                                  Slow Learner
                                  • Dec 2010
                                  • 7870

                                  #17
                                  Re: dell 2007 WFPb monitor ,no lights

                                  Originally posted by Davi.p
                                  i don't know why people here are troubleshooting you for bad backlight..
                                  As one of the" people here "I was not troubleshooting for a backlight per se .It was a simple test that the OP could do with the boards out of the machine.while he was waiting to charge up his camera.
                                  I went on to say he could check fuses. so who is troubleshooting for a bad backlight?
                                  Please upload pictures using attachment function when ask for help on the repair
                                  http://www.badcaps.net/forum/showthread.php?t=39740

                                  Comment

                                  • aortiz
                                    Senior Member
                                    • Feb 2014
                                    • 120
                                    • mexico

                                    #18
                                    Re: dell 2007 WFPb monitor ,no lights

                                    as a novice to this field of lcd monitors i dont know what a backlight looks like.

                                    on the monitor i am using now ,i see a strong blue screen when i turn it on with the cpu disconnected , and a small square sign that says "RGV,VIDEO LOSS"and it stays on as long as the monitor stays turned on.is this what the backlight on the dell 2007 monitor should look like?
                                    on the dell 2007 i think i remember seeing a white screen with a small blue square that said "NO ANALOG INPUT",and i dont remember if it disapeared after a while.
                                    let me try your suggestions ,do i have to screw all the boards back into the frame of the monitor? ,or i can try to somehow do it with the boards out, the way they are now?
                                    everybody's suggestions are welcome and appreciated by me ,it gives me an opportunity to learn something else at my old age,and i thank everybody and ask you to keep posting them.

                                    Comment

                                    • aortiz
                                      Senior Member
                                      • Feb 2014
                                      • 120
                                      • mexico

                                      #19
                                      Re: dell 2007 WFPb monitor ,no lights

                                      ok ,thank you,i was just being curious as to what the other pins of the transformer would read.
                                      it is a good thing the readings look normal,the transformer came out clean ,i used my solder socket and some solder resin and came out no trouble ,its back on again.
                                      sorry ,about the thing on the other thread,like i said ,i am new to this forum thing and i am just getting the hung of it.
                                      still dont know which "other thread" you mean,i have been looking all around and maybe i did something wrong ,but by all means was not in purpose.if you can kind of explain what i should not do,for the good of the forum i wont do it.
                                      i do appreciate everybody's help and suggestions and dont want create any problems to the forum and the people in it.keep posting please.

                                      Comment

                                      • selldoor
                                        Slow Learner
                                        • Dec 2010
                                        • 7870

                                        #20
                                        Re: dell 2007 WFPb monitor ,no lights

                                        Dont worry about it - a Thread with "guide" or "teardown" or "fixed/ repaired/mended"
                                        in the title is in most cases just there as a reference for members to read.
                                        General rule is that members should first use the search to see if there are other thread regarding their machine and it may even cover their exact problem.
                                        If there is no thread or the problem is not mentioned then it is better to start a new thread. Another reason to start a new thread is when the enquirer has little experience, then there can be more interaction and explanation which would not be of interest to a professional technician.
                                        It is your thread and you can ask what you want, whether you think it is off topic, silly or whatever. You may get some rather curt replies if it is something you can quickly look up on google but again dont worry about it. It is easy to google something if you know what to ask but when you dont you get loads of unrelated information.
                                        Example " what is that board with the blue socket called"
                                        but if you look at the board there will be a long number on it if you google that number it will (most of the time) come up with something that will tell you what board it is.

                                        I have to say this set is a huge beast with lots of boards and not easy to manage or repair so it is an ambitious project for a beginner. It is usual to start with small 15 or 17 inch monitors which only have two boards.
                                        I hope this general chat is useful to you.
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Bowline
                                          Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
                                          by Bowline
                                          My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

                                          Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

                                          My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
                                          The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
                                          I have tried multiple different Dell power adapters. My Dell...
                                          06-11-2025, 10:13 AM
                                        • DanPoka
                                          Guide me through repairing a Dell p2210f LCD ccfl backlight monitor
                                          by DanPoka
                                          I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
                                          Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
                                          This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...
                                          02-15-2025, 05:05 AM
                                        • Jesus Coder
                                          Issues Reviving Old Dell 2408WFPb Monitor
                                          by Jesus Coder
                                          Hello everyone,

                                          I have been having some difficulties reviving an old Dell 2408WFPb PC monitor that I received for free. When I first acquired it, the backlights of the display were on but alas no image was showing. After extensive research on the topic, I went ahead and purchased a new t-con board for the monitor. After installing the board, I was then presented with a new screen that was half black and half green (more so black). I have been unable to figure out what to do next as I have limited knowledge of display electronics. Might anyone on this forum have an idea of what may...
                                          06-25-2023, 02:33 PM
                                        • ChristianBr01
                                          Dell 34 inch U3419W Monitor with thin stripes on partial screen
                                          by ChristianBr01
                                          Hello everyone,
                                          I have a Dell U3419W Monitor that has some thin stripes on a part of the screen since Tuesday.
                                          This lines cover about a third of the screen and appear for 2 seconds before disappear for another 2 seconds.
                                          This repeats the whole time. I have not opened the case yet cause I had no time, but will try to fix it on this weekend. For me, it looks like a problem on the TCon... Am I right?
                                          Does someone have seen this before?...
                                          05-23-2025, 06:06 AM
                                        • paparazzo79
                                          HP adapter for Dell monitor
                                          by paparazzo79
                                          Hi guys.
                                          I got myself used Dell 27" touch monitor but I got scammed again, seller sent HP adapter.
                                          Though voltages are the same, I suppose power supply design is not the same.
                                          So may I use it without any harm to the monitor?...
                                          05-17-2024, 05:40 AM
                                        • Loading...
                                        • No more items.
                                        Working...